Teresie K. Isaksen, Søndeled, Aust-Agder

I am searching for information on Teresie K. Isaksen, born abt 1861, to Isak Andersen and Anne Oline Jakobsdatter, in Søndeled Landsogn, Aust-Agder. Teresie is the sister of my great grandfather, Anders Isaksen. Isak Andersen died very young, since Anne Oline is already a widow at 21 years of age, according to the 1865 census. She and her two children at the time, are living with her parents. http://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbase&sidenr=3&filnamn=f60913&gardpostnr=312&personpostnr=1742&merk=1742#ovre By 1881, Anne Oline was remarried to Kristian Stenersen and they lived on part of the farm Auslandsbråtane. In 1905 it was owned by - Rannei, Sofie and Inger Stenersen, who I believe to be Anne Oline and Kristian’s children. My great grandfather came over in 1888 and from what I’ve learned from my uncle, he had a problem with someone, possibly his stepfather Kristian and decided to leave Norway. I have lots of information on my great grandfather, it's just information on his sister that I'm searching for. I’ve had help from a person at the Søndeled Historical Society, but she can’t find out what happened to Teresie. I’d appreciate any help you can give. Thanks, Wanda